A large number of empty game objects

In my game, to build a car route I use points. In this case, these are empty game objects. There are about 600 of them, for a big city. They do not move. I noticed that my editor started to hang, but will this affect the game when playing?

Good day.

I dont think they are the problem, 600 empty gameobjects is not too much. What PC you have? Game is for PC or for moblie?

But what you can do, is to mark them as static in the inspector and to make them SetActive(false) if are far away from the player, so they consume less CPU.